Summer league's number means nothing but still something to see(my take-prediction)
Josh Jackson:
As expected Jackson can no longer rely on his athletism to just tank to the paint, and nor is his 3 ball good enough, so he has to rely on midrange/Floater and cutting, driving closeouts, he has the touch and dribble to do those, but that's it,he didn't have enough skill to score constantly
If developed well his ceiling is a Butler-like all-star (for that he needs to learn to buy fouls and make the fts..), no domination
Fox:
He has scorer's instinct and touch, he can score everywhere except the 3, with his speed and floaters he would very likely be a wade-type(worse 3 shooting, better passing and defense) allstar, and he is also a KG like voice leader which is a big plus for his team
On the other hand in the new NBA a scoring guard who can't shoot 3s is a big disadvantage
and his size/length will hold back his overall impact despite his great defense
So my take is both has fairly allstar potential(not going to bust like Ball), Jackson's uncertainty is higher, and Both are lesser project than Tatum (superstar potential with high ceiling and low risk)